209660163328 has 144 divisors (see below), whose sum is σ = 552461019264. Its totient is φ = 76880609280.

The previous prime is 209660163319. The next prime is 209660163329. The reversal of 209660163328 is 823361066902.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209660163329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22276 + ... + 647932.

It is an arithmetic number, because the mean of its divisors is an integer number (3836534856).

Almost surely, 2^209660163328 is an apocalyptic number.

209660163328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209660163328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276230509632).

209660163328 is an abundant number, since it is smaller than the sum of its proper divisors (342800855936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209660163328 is a wasteful number, since it uses less digits than its factorization.

209660163328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625708 (or 625694 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 46.

The spelling of 209660163328 in words is "two hundred nine billion, six hundred sixty million, one hundred sixty-three thousand, three hundred twenty-eight".